Last week, Massachusetts Rep. Bill Delahunt introduced a bill called the “Main Street Fairness Act,” which is a stupid name for a bill. The text of the bill hasn’t been released yet, but if passed, it would presumably set up a process where sales tax could be collected on purchases made over the Internet. As anyone who has shopped online over the past decade is probably aware, this has been an ongoing and thorny issue, since billions in online sales tax would provide a welcome revenue stream for struggling states.